from llama_index.llms.openai import OpenAI

llm = OpenAI(model="gpt-4.1-nano",
             api_key="sk-CftUbVSsA61lwwgMz9xvt6znTunQZfgBP8ZCVLbQsKfXUR6k",
             api_base="https://www.henapi.top/v1", )